import axios from 'axios'
import {blobValidate, tansParams} from "./utils"
import {ElLoading, ElMessage, ElNotification} from 'element-plus'
import useUserStore from '@/store/modules/user'
import cache from '@/plugins/cache'
import {getToken} from '@/utils/auth'
import {saveAs} from 'file-saver'
import router from '@/router'

const codeMap = {
    '401': '认证失败，无法访问系统资源',
    '403': '当前操作没有权限',
    '404': '访问资源不存在',
    'default': '系统未知错误，请反馈给管理员'
}

// 是否显示重新登录
export let isRelogin = {show: false};

// 创建axios实例
const v3api = axios.create({
    baseURL: '/api',
    timeout: 100000
});

v3api.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'

v3api.interceptors.request.use(config => {
    // 是否需要设置 token
    const isToken = (config.headers || {}).isToken === false
    // 是否需要防止数据重复提交
    const isRepeatSubmit = (config.headers || {}).repeatSubmit === false
    if (getToken() && !isToken) {
        config.headers['Authorization'] = 'Bearer ' + getToken() // 让每个请求携带自定义token 请根据实际情况自行修改
    }


    // get请求映射params参数
    if (config.method === 'get' && config.params) {
        let url = config.url + '?' + tansParams(config.params);
        url = url.slice(0, -1);
        config.params = {};
        config.url = url;
    }
    if (!isRepeatSubmit && (config.method === 'post' || config.method === 'put')) {
        const requestObj = {
            url: config.url,
            data: typeof config.data === 'object' ? JSON.stringify(config.data) : config.data,
            time: new Date().getTime()
        }
        const sessionObj = cache.session.getJSON('sessionObj')
        if (sessionObj === undefined || sessionObj === null || sessionObj === '') {
            cache.session.setJSON('sessionObj', requestObj)
        } else {
            const s_url = sessionObj.url;                  // 请求地址
            const s_data = sessionObj.data;                // 请求数据
            const s_time = sessionObj.time;                // 请求时间
            const interval = 1000;                         // 间隔时间(ms)，小于此时间视为重复提交
            if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
                const message = '数据正在处理，请勿重复提交';
                return Promise.reject(new Error(message))
            } else {
                cache.session.setJSON('sessionObj', requestObj)
            }
        }
    }
    return config
}, error => {
    Promise.reject(error)
})

// 响应拦截器
v3api.interceptors.response.use(res => {
        // 未设置状态码则默认成功状态
        const code = res.data.code || 200;
        // 获取错误信息
        const msg = codeMap[code] || res.data.msg || codeMap['default']

        // if (res.request.responseType ===  'blob'
        //   && res.headers["content-type"] ==="application/force-download;charset=utf-8") {
        //   return res
        // }
        // // 二进制数据则直接返回
        // if (res.request.responseType ===  'blob' || res.request.responseType ===  'arraybuffer') {
        //   return res.data
        // }

        if (code === 401) {
            if (!isRelogin.show) {
                isRelogin.show = false;
                // location.href = '/login';
                router.push({name: 'login'})
                useUserStore().$reset();
            }
            return Promise.reject('无效的会话，或者会话已过期，请重新登录。')
        } else if (code === 500) {
            ElMessage({
                message: msg,
                type: 'error'
            })
            return Promise.reject(new Error(msg))
        } else if (code !== 200) {
            ElNotification.error({
                title: msg
            })
            return Promise.reject('error')
        } else {
            return res.data
        }
    },
    error => {
        let {message} = error;
        if (message == "Network Error") {
            message = "后端接口连接异常";
        } else if (message.includes("timeout")) {
            message = "系统接口请求超时";
        } else if (message.includes("Request failed with status code")) {
            message = "系统接口" + message.substr(message.length - 3) + "异常";
        }
        ElMessage({
            message: message,
            type: 'error',
            duration: 5 * 1000
        })
        return Promise.reject(error)
    }
)


// 通用下载方法
export function download(url, params, filename) {
    let downloadLoadingInstance = ElLoading.service({
        text: "正在下载数据，请稍候", spinner: "el-icon-loading", background: "rgba(0, 0, 0, 0.7)"
    })
    return v3api.post(url, params, {
        transformRequest: [(params) => {
            return tansParams(params)
        }],
        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
        responseType: 'blob'
    }).then(async (data) => {
        const isLogin = await blobValidate(data);
        if (isLogin) {
            const blob = new Blob([data])
            saveAs(blob, filename)
        } else {
            const resText = await data.text();
            const rspObj = JSON.parse(resText);
            const errMsg = codeMap[rspObj.code] || rspObj.msg || codeMap['default']
            if(rspObj.code===401){
                ElMessage.error("用户登录过期，请重新登录")
            }else{
                ElMessage.error(errMsg);
            }
        }
        downloadLoadingInstance.close();
    }).catch((r) => {
        console.error(r)
        ElMessage.error('下载文件出现错误，请联系管理员！')
        downloadLoadingInstance.close();
    })
}

export default v3api
